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Use the $set operator to set a particular value. The $set operator requires the following syntax:

db.collection.update( { field: value1 }, { $set: { field1: value2 } } );

This statement updates in the document in collection where field matches value1 by replacing the value of the field field1 with value2. This operator will add the specified field or fields if they do not exist in this document or replace the existing value of the specified field(s) if they already exist.

←   $rename $unset  →